That is extremely unprofessional conduct on that office to drop you without notice and without a referral and leave you without a means of continuing on the medications they supplied. You are probably havering withdrawals from the Zoloft, it is a well known side effect. This is endangering your health and possibly making future stability harder. Call them and tell them they need to find you continuity of services and if they refuse call your local Disability Rights office and tell them you were dropped without notice and now have no way to get services or medications and are in withdrawal.

I get so sick of doctors who think nothing of ethics. Only their pockets. If they decide to drop an insurance they need to give people warnings and help with continuity of services.